CITIZEN BM7631-87M ECO-DRIVE STAINLESS STEEL MEN WATCH
BM7631-87M
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- 3 Years Warranty
The Citizen BM7631-87M pairs a bright turquoise dial with a case design that does something almost nothing else at this price does: the bezel is faceted and angular, carrying an engraved 10-to-60 scale in large numerals with small hexagonal accents set between them. Most watches in this bracket use a plain polished bezel. This one has structure.
The dial itself is kept clean against it — no numerals, just applied luminous baton markers, luminous hands, a fine minute track and a date window at 3 o'clock. The turquoise shifts with the light, reading bluer outdoors and greener under warm indoor lighting.
It runs on Eco-Drive Calibre E111: any light charges it, a full charge holds approximately six months in darkness, and there is no battery to replace at any point in the watch's life. The 41mm stainless steel case is 9.7mm thick and 130 grams on the bracelet, rated to 100 metres.
At a Glance
- BrandCitizen
- MovementEco-Drive Calibre E111
- Case Size41mm
- Thickness9.7mm
- Weight130g
- DialTurquoise
- BezelFaceted, Engraved 10–60 Scale
- MarkersApplied, Luminous
- Date3 O'Clock
- GlassMineral
- Power ReserveApprox. 6 Months
- Water Resistance100m (10 BAR)
Why You'll Love It
- The faceted bezel with its engraved 10-to-60 scale is what separates this from every plain-bezel steel watch at the price. It gives the case real structure and catches light across the facets rather than reflecting flatly.
- Turquoise is genuinely uncommon in this bracket. Almost everything here is black, white or navy — this one is recognisable across a room without shouting.
- The colour shifts with the light, reading bluer outdoors and greener indoors. That movement is what stops a flat dial from being boring.
- The dial is kept deliberately clean against a busy bezel — no numerals, just applied luminous batons and a fine minute track, so the two elements do not fight each other.
- It never needs a battery. Eco-Drive converts any light into power, with roughly six months of reserve from a full charge and no service appointments to remember.
- Applied markers rather than printed ones catch light and give the dial depth. It is a small manufacturing step up that is easy to see in person.
- At 9.7mm thick this is slim for a 41mm sports watch, so it sits flat and slides under a cuff rather than catching on it.
- 100-metre water resistance is a real rating — swimming, showering and snorkelling are all comfortably within it.
Perfect For
- Unusual Dial Colours
- Everyday Wear
- Low-Maintenance Wearers
- Beach & Pool
- Smart Casual Office
- Travel & Commuting
- Birthday Gift for Him
- Father's Day Gift
Key Features
- Faceted bezel with engraved 10–60 scale — angular, multi-surfaced, with large engraved numerals and small hexagonal accents set between them.
- Turquoise dial — a bright aqua that shifts between blue and green depending on the light.
- Applied luminous baton markers and luminous hands — raised markers rather than printed, with luminous fill for low-light legibility.
- Citizen Eco-Drive Calibre E111 — powered by any light source, natural or artificial, with a power reserve of approximately six months from a full charge. No battery replacement, ever.
- Date display at 3 o'clock — a calendar window in the traditional position.
- 41mm stainless steel case — 9.7mm thick, weighing 130 grams on the bracelet.
- Multi-link stainless steel bracelet — brushed with polished bevels.
- Mineral glass — impact resistant, over the dial.
- Insufficient charge warning and overcharge prevention — the watch signals when it needs light, and protects the cell once fully charged.
- 100-metre water resistance (10 BAR) — rated for swimming, showering and snorkelling. Not rated for scuba diving.
Technical Specifications
The Citizen BM7631-87M is a 41mm men's watch powered by Citizen's Eco-Drive Calibre E111 — a light-powered quartz movement with a power reserve of approximately six months, an insufficient-charge warning and overcharge prevention. The stainless steel case measures 9.7mm thick, weighs 130 grams and carries a faceted bezel with an engraved 10-to-60 scale and hexagonal accents, with mineral glass over a turquoise dial with applied luminous baton markers, luminous hands and a date window at 3 o'clock. Fitted to a multi-link stainless steel bracelet and water resistant to 100 metres.
| Model Number | BM7631-87M |
| Case Material | Stainless Steel |
| Case Colour | Silver-Tone |
| Case Diameter | 41mm |
| Case Thickness | 9.7mm |
| Weight | 130g |
| Bezel | Fixed, Faceted, Engraved 10–60 Scale |
| Glass | Mineral Glass |
| Water Resistance | 100 Metres (10 BAR) |
| Colour | Turquoise |
| Markers | Applied Batons, Luminous |
| Hands | Silver-Tone, Luminous |
| Date Display | 3 O'Clock |
| Material | Stainless Steel |
| Style | Multi-Link, Brushed with Polished Bevels |
| Calibre | Citizen E111 |
| Type | Eco-Drive (Light-Powered Quartz) |
| Power Reserve | Approx. 6 Months (Fully Charged) |
| Insufficient Charge Warning | Yes |
| Overcharge Prevention | Yes |
| Battery Replacement | Not Required |
Best Matched With
- White Linen Shirt
- Navy Polo
- Grey Chinos
- Light Denim
- Cream Overshirt
- White Sneakers
- Resort Wear
Frequently Asked Questions
Is the dial blue or green?
Turquoise — a bright aqua that sits between the two. In daylight it reads bluer; under warm indoor light it leans greener. If you are expecting a navy dial or a forest green one, this is neither.
Does the bezel rotate?
No. The 10-to-60 scale is engraved into a fixed bezel — it is a design element rather than a timing tool, so you cannot rotate it to mark elapsed time. What it does give the case is structure and light-catch that a plain polished bezel does not.
Are the markers luminous?
Yes. The applied baton markers and the hands both carry luminous fill, so the time stays readable in low light. Applied markers are raised from the dial rather than printed onto it, which also gives the dial depth in daylight.
How does Eco-Drive work?
A solar cell beneath the dial converts light into electrical energy and stores it in a rechargeable cell. Any light works — sunlight, office lighting, a lamp. Normal daily wear keeps it running indefinitely, and there is no battery to replace at any point in the watch's life.
What happens if I don't wear it for a while?
A fully charged watch keeps running for approximately six months in complete darkness. If it does stop, leaving it in bright light for a few hours restarts it and you simply reset the time. Storing it face-up near a window rather than in a closed drawer avoids the issue.
What is the insufficient charge warning?
When the charge runs low, the seconds hand starts moving in two-second jumps instead of one. That is the watch telling you it needs light. Place it somewhere bright for a few hours and normal operation resumes.
Can I overcharge it by leaving it in the sun?
No. Overcharge prevention stops the cell taking on more energy once it is full, so leaving the watch in bright light does no harm. Avoid prolonged exposure to extreme heat, such as a car dashboard in direct sun — heat rather than light is what damages a watch.
Will 41mm fit my wrist?
41mm suits wrists from roughly 16.5cm upward and is the most common men's size for good reason — substantial enough to read easily, moderate enough to stay versatile. At 9.7mm thick it is slim for a sports watch and sits flat under a cuff.
Is the glass sapphire?
No — this model uses mineral glass, which resists impact well but will pick up fine scratches over years of daily wear. If sapphire matters to you, the Citizen Tsuyosa and Super Titanium ranges use it as standard.
Can I swim with this watch?
Yes. With 100-metre (10 BAR) water resistance it is suitable for swimming, showering and snorkelling. It is not rated for scuba diving. Rinse with fresh water after saltwater or pool exposure.
Is the bracelet adjustable?
Yes. The stainless steel bracelet can be resized by adding or removing links. City Chain offers complimentary bracelet sizing at any outlet — bring your warranty book along for the service.
What warranty does this watch come with?
The BM7631-87M comes with a 3-year warranty when purchased from City Chain Singapore, an authorised Citizen retailer. Keep your warranty card and proof of purchase — both are required when submitting the watch for service at any City Chain outlet.
Why Buy from City Chain Singapore
- Authorised Retailer 100% genuine Citizen product
- 3-Year Warranty Covered on every purchase
- Free Shipping All orders within Singapore
- Bracelet Adjustment Size it in-store
Extra $15 OFF with min. $200 spend
Use Code: FORYOU15
Extra $30 OFF with min. $400 spend
Use Code: FORYOU30
Calibre: E111
Eco-Drive (recharged by any light source, no need to change battery)
Date Display
Case Color: Silver
Case Diameter: 41mm
Case Thickness: 9.7mm
Case Material: Stainless Steel
Glass: Mineral Glass
Strap Material: Stainless Steel
Date Display
Eco-Drive
Insufficient Charge Warning Function
Overcharge Prevention Function
Water Resistance: 10 ATM
Weight: 130g
Delivery within Singapore
Order by 11AM
(Mon - Fri for faster processing)
Checkout options may vary depending on order value and eligibility.
• Free Speedpost Domestic Delivery — 1–2 business days
• Free DHL Domestic Delivery — next business day
• Express Delivery — S$30, order by 2PM
• Click & Collect — ready in 2–3 business days. Please wait for the collection confirmation email before visiting the store.
Weekend & Public Holiday Orders
Orders placed after the applicable cut-off time, on weekends, or on public holidays will be processed on the next business day. Delivery will take place on the next available business day based on the selected delivery service.
During peak periods, festive seasons, major launches or sale events, additional processing and delivery time may be required.
For online purchase, you can have bracelet or leather strap adjustments done at any City Chain store. Please bring along your warranty book for the service.
